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Interpenetrating LiB/Li3BN2 phases enabling stable composite lithium metal anode.

Piao Qing1, Shaozhen Huang2, Tuoya Naren2

  • 1State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; National Energy Metal Resources and New Materials Key Laboratory, Central South University, Changsha 410083, China.

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Summary

A new robust composite lithium anode (LBN) using hexagonal boron nitride (h-BN) overcomes dendrite growth and volume changes. This material enables stable, long-lasting lithium metal batteries with enhanced performance.

Keywords:
InterpenetratingLi metal anodeLi(3)BN(2)Li-B alloyUltrathin

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Host-less lithium metal anodes face challenges like volume expansion and dendrite formation, hindering practical battery applications.
  • Interpenetrating phase composites offer enhanced mechanical properties for advanced materials.

Purpose of the Study:

  • To develop a robust composite lithium anode (LBN) material to address the limitations of traditional lithium metal anodes.
  • To investigate the structural and electrochemical properties of a novel LiB/Li3BN2 composite derived from Li and hexagonal boron nitride (h-BN).

Main Methods:

  • Fabrication of a composite Li anode (LBN) via metallurgical reaction between Li and h-BN, forming interpenetrating LiB/Li3BN2 phases.
  • Processing of ultrathin, freestanding LBN foil through rolling.
  • Electrochemical evaluation including cycling stability, Coulombic efficiency, and performance in LiCoO2|LBN pouch cells.

Main Results:

  • The LBN material exhibits reinforced mechanical strength and structural stability due to the anchoring of LiB fibers by Li3BN2 granules.
  • Ultrathin (15 μm) and freestanding LBN foils were successfully prepared.
  • The LBN anode achieved high Coulombic efficiency (99.69%) and a long lifespan (2500 h).
  • LiCoO2|LBN pouch cells demonstrated excellent cycling stability, retaining 90.1% capacity after 450 cycles.

Conclusions:

  • The interpenetrating LiB/Li3BN2 architecture provides exceptional cycling stability and mechanical robustness for lithium metal anodes.
  • The developed composite anode offers a promising solution for high-performance, long-lasting lithium metal batteries.
  • This work presents a novel approach for processing thin lithium strips and designing reinforced architectures with potential applications beyond batteries.